Description: Complete the RS485 communication queries, query communication, communication status judgment
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File list (Check if you may need any files):
RS485通信实验(查询方式)
.......................\RS485
.......................\RS485.LST
.......................\RS485.M51
.......................\RS485.OBJ
.......................\RS485.Uv2.bak
.......................\RS485.c
.......................\RS485.hex
.......................\RS485.lnp
.......................\RS485.opt.bak
.......................\RS485.plg
.......................\RS485.uvopt
.......................\RS485.uvproj
.......................\RS485_Opt.Bak
.......................\RS485_Uv2.Bak
.......................\RS485_uvopt.bak
.......................\RS485_uvproj.bak
.......................\STARTUP.A51
.......................\STARTUP.LST
.......................\STARTUP.OBJ
.......................\c8051F020.h